skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Modeling ion effects for the Argonne Advanced Photon Source upgrade

Abstract

Ions are produced in an accelerator when the beam ionizes residual gas inside the vacuum chamber. If the beam is negatively charged, ions can become trapped in the beams potential, and their density will increase over time. Trapped ions can cause a variety of undesirable effects, including instability and emittance growth. This paper will discuss the possibility of ion trapping and instability in the APS-Upgrade storage ring. The question of where ions will be trapped is addressed using simple analytical calculations, while the instability is modeled with computer simulations. A scheme is proposed for mitigating the ion instability, by using train gaps with a high charge bunch before and after the gap to minimize rf transients. The reduction in ion density due to nonevaporable getter coating is also discussed.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1607560
Alternate Identifier(s):
OSTI ID: 1798841
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 11; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; beam code development & simulation techniques; beam instabilities; high intensity beam dynamics; relativistic multiple-particle dynamics

Citation Formats

Calvey, J., and Borland, M.. Modeling ion effects for the Argonne Advanced Photon Source upgrade. United States: N. p., 2019. Web. https://doi.org/10.1103/PhysRevAccelBeams.22.114403.
Calvey, J., & Borland, M.. Modeling ion effects for the Argonne Advanced Photon Source upgrade. United States. https://doi.org/10.1103/PhysRevAccelBeams.22.114403
Calvey, J., and Borland, M.. Fri . "Modeling ion effects for the Argonne Advanced Photon Source upgrade". United States. https://doi.org/10.1103/PhysRevAccelBeams.22.114403.
@article{osti_1607560,
title = {Modeling ion effects for the Argonne Advanced Photon Source upgrade},
author = {Calvey, J. and Borland, M.},
abstractNote = {Ions are produced in an accelerator when the beam ionizes residual gas inside the vacuum chamber. If the beam is negatively charged, ions can become trapped in the beams potential, and their density will increase over time. Trapped ions can cause a variety of undesirable effects, including instability and emittance growth. This paper will discuss the possibility of ion trapping and instability in the APS-Upgrade storage ring. The question of where ions will be trapped is addressed using simple analytical calculations, while the instability is modeled with computer simulations. A scheme is proposed for mitigating the ion instability, by using train gaps with a high charge bunch before and after the gap to minimize rf transients. The reduction in ion density due to nonevaporable getter coating is also discussed.},
doi = {10.1103/PhysRevAccelBeams.22.114403},
journal = {Physical Review Accelerators and Beams},
number = 11,
volume = 22,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
Free Publicly Available Full Text

Save / Share:

Works referenced in this record:

Commissioning Simulations for the APS Upgrade Lattice
text, January 2015


Photodesorption and Electron Yield Measurements of Thin Film Coatings for Future Accelerators
text, January 2015


Suppression of beam-ion instability in electron rings with multibunch train beam fillings
journal, August 2011

  • Wang, L.; Cai, Y.; Raubenheimer, T. O.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 14, Issue 8
  • DOI: 10.1103/PhysRevSTAB.14.084401

Beam ion instability: Measurement, analysis, and simulation
journal, October 2013


Lower Emittance Lattice for the Advanced Photon Source Upgrade Using Reverse Bending Magnets
text, January 2017


Ion Effects in the APS Particle Accumulator Ring
text, January 2017


Progress on the Final Design of the APS-Upgrade Storage Ring Vacuum System
text, January 2018


Measuring and optimizing the momentum aperture in a particle accelerator
journal, May 2002


Lifetime and Beam Size in a Storage Ring
journal, May 1963


The anti-bend cell for ultralow emittance storage ring lattices
journal, February 2014

  • Streun, A.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 737
  • DOI: 10.1016/j.nima.2013.11.064

First Observations of a “Fast Beam-Ion Instability”
journal, July 1997


Improvements in Modeling of Collective Effects in ELEGANT
text, January 2015


Transient beam loading effects in harmonic rf systems for light sources
journal, September 2002

  • Byrd, J. M.; De Santis, S.; Jacob, J.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 5, Issue 9
  • DOI: 10.1103/PhysRevSTAB.5.092001

Transient Beam Loading Due to the Bunch Train Gap and Its Compensation Experiments at BEPC-II and ALS
text, January 2018


Superconducting Harmonic Cavity for the Advanced Photon Source Upgrade
text, January 2015


Instability Thresholds for the Advanced Photon Source Multi- Bend Achromat Upgrade
text, January 2015


Fast beam-ion instability. II. Effect of ion decoherence
journal, November 1995

  • Stupakov, G. V.; Raubenheimer, T. O.; Zimmermann, F.
  • Physical Review E, Vol. 52, Issue 5
  • DOI: 10.1103/PhysRevE.52.5499

Modeling of Impedance Effects for the APS-MBA Upgrade
text, January 2015


Fast beam-ion instability. I. Linear theory and simulations
journal, November 1995